Material Selection and Quality for Ceramic Rolling Elements
Silicon nitride has the best combination of physical and mechanical properties for use as rolling elements in hybrid ceramic bearings. The term ‘silicon nitride’ describes a family of materials, including alpha- and beta-sialons, with different compositions and made by different processing routes. Not all types of silicon nitride are suitable for use in rolling bearing applications where stresses may be as high as 4 GPa. Specification and selection of types or grades of material together with the associated quality control parameters are important aspects in the development of hybrid ceramic bearings.
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